CN105162538A - Cognitive user selection method based on optimal performance - Google Patents

Cognitive user selection method based on optimal performance Download PDF

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CN105162538A
CN105162538A CN201510464053.3A CN201510464053A CN105162538A CN 105162538 A CN105162538 A CN 105162538A CN 201510464053 A CN201510464053 A CN 201510464053A CN 105162538 A CN105162538 A CN 105162538A
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user
cognitive
cognitive user
authorized user
authorized
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卢为党
皇甫增迪
何娣
华惊宇
徐志江
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

Provided is a cognitive user selection method based on optimal performance. According to the method, if cognitive users can help an authorized user to reach a target rate, a chance for accessing the spectrum of the authorized user may be obtained; and a cognitive system selects one cognitive user capable of obtaining the optimal performance to access the spectrum of the authorized user. After accessing the spectrum of the authorized user, the cognitive user uses a portion of the bandwidth to forward the information of the authorized user so as to help the authorized user to reach the target rate, and then uses the rest of the bandwidth to send the information of the cognitive user. By adopting the method of the invention, mutual interference between the authorized user and the cognitive user can be effectively eliminated, and the performance of cognitive users can be improved.

Description

A kind of cognitive user system of selection based on best performance
Technical field
The invention belongs to the cognition wireless technical field of telecommunications in wireless communication field, especially a kind of cognitive user system of selection.
Background technology
Along with the development of wireless communication technology, wireless communication user is on the increase, and business demand increases fast, and limited radio spectrum resources becomes the bottleneck of restriction development of wireless communication systems gradually.A large amount of research report shows that the utilance of current wireless frequency spectrum only has 15% ~ 85%, major part frequency spectrum is not fully utilized when majority, and frequency spectrum service condition is very uneven, some unauthorized frequency ranges take too crowded, and some authorizes frequency range to be then often in idle condition.The visible main cause causing frequency spectrum resource in short supply is existing this fixed spectrum management mode and spectrum allocation strategy.Cognitive radio technology can by the wireless communications environment around perception, under the impregnable prerequisite of guarantee authorized user proper communication, waits for an opportunity insertion authority frequency spectrum, effectively can promote the utilance of frequency spectrum resource.
Coexist in formula frequency spectrum access method at cognitive radio, cognitive user is insertion authority frequency spectrum under certain condition, uses identical frequency range with authorized user simultaneously.So in this frequency spectrum access method, there is interference all the time between understanding user and authorized user, make originally just very limited frequency spectrum resource not be fully used, the performance of authorized user and cognitive user also can be affected due to interference.When there being multiple understanding user in cognitive system, the performance obtained after selecting the frequency spectrum of different cognitive user insertion authority users can be different.
Summary of the invention
Mutually disturb to overcome in the existing formula frequency spectrum access technology that coexists between authorized user and cognitive user, deficiency that cognitive user performance is lower, the invention provides the problem of interference mutually between a kind of effective elimination authorized user and cognitive user, promote the cognitive user system of selection based on best performance of cognitive user performance.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of cognitive user system of selection based on best performance, radio communications system comprises a main system and a cognitive system, wherein, authoring system is made up of an authorized user transmitting terminal and authorized user receiving terminal, described authoring system supports relay function, the mandate frequency spectrum be made up of one section of W bandwidth; Cognitive system is made up of L cognitive user transmitting terminal and a common cognitive user receiving terminal, and it attempts the frequency spectrum utilizing possible transmission opportunity insertion authority system.We suppose that cognitive system can simulate radio protocol and the system parameters of authoring system; The anti-interference frequency spectrum access method of described cooperation comprises following process:
1) cognitive user is with the frequency spectrum of cooperation mode insertion authority user, after cognitive user receives the information of authorized user, helps the information sending authorized user to authorized user receiving terminal by decoding forward collaboration mode;
2) each cognitive user ST kcalculate the speed R that authorized user can be helped to reach after oneself insertion authority user frequency spectrum p,k;
3) find out all authorized users that can help and reach targeted rate R tcognitive user ST kthe set M of composition, M={k|k ∈ L, R p,k>=R t;
4) in set M, a cognitive user ST is selected b, authorized user distributes portion of time to this cognitive user, authorizes it to access the frequency spectrum of oneself, ST bafter the frequency spectrum of insertion authority user, the information utilizing a part of bandwidth to forward authorized user helps it to reach targeted rate, utilizes remaining bandwidth to send the information of oneself; If M is empty set, namely | M|=0, represents and does not have cognitive user that authorized user can be helped to reach targeted rate, then authorized user continues through to direct transfer and sends the information of oneself;
Time between authorized user and cognitive user and bandwidth allocation problems are modeled as:
Meet the following conditions
Wherein, R trepresent the targeted rate of authorized user, t krepresent that authorized user sends the time shared by oneself information at the first time slot, b krepresent understanding user ST kauthorized user is helped to reach targeted rate bandwidth used at second time slot.R p,kand R s,krepresent cognitive user ST respectively kafter the frequency spectrum of insertion authority user, the speed that authorized user and cognitive user obtain,
R s,k＝(1-t k)(1-b k)R 4,k(4)
Wherein p s,krepresent cognitive user ST ktransmitting power, γ 4, krepresent the channel gain of cognitive user transmitting terminal to cognitive user receiving terminal link, N 0represent noise power spectral density, with represent the speed that authorized user obtains at first time slot and second time slot respectively:
Wherein p prepresent the transmitting power of authorized user, γ 1and γ 2, krepresent that authorized user transmitting terminal is to authorized user receiving terminal with to cognitive user transmitting terminal ST respectively kthe channel gain of link, γ 3, krepresent cognitive user transmitting terminal ST kto the channel gain of authorized user receiving terminal link;
Above-mentioned optimal time is obtained by Mathematics Optimization Method and allocated bandwidth
(7), (8) are substituted into (4), and the speed obtaining being familiar with user is
Wherein A=(R 2, k-R t), B=(R 5, k-R d), C=(R 2, k+ R 3, k-R 5, k), D=(R 2, k-R d).
Further, described step 1) in, cognitive user is by the frequency spectrum of two slot decoder forward collaboration mode insertion authority users;
At first time slot, holding time t k(0 < t k< 1), the whole W bandwidth of authorized user transmitting terminal sends information to mandate receiving terminal and cognitive user transmitting terminal, so authorized user transmitting terminal to the speed of cognitive user transmitting terminal link is:
At second time slot, holding time (1-t k), cognitive user transmitting terminal b kw (0 < b k< 1) bandwidth helps the information of the authorized user transmitting terminal of decoding to send to mandate receiving terminal, so cognitive user transmitting terminal to authorizing the speed of receiving terminal link is:
So the speed that authorized user is obtained under the help of cognitive user by two time slots is:
Meanwhile, cognitive user utilizes remaining (1-b) W bandwidth to send the information of oneself, so the speed that cognitive user obtains is:
R s,k＝(1-t k)(1-b k)R 4,k(4)。
Further, described step 4) in, cognitive user ST kselect by the following method: the frequency spectrum selecting to obtain the cognitive user insertion authority user of optimal performance, namely select cognitive user ST k, m={k|k ∈ L, R p,k[i]>=R t, the frequency spectrum of insertion authority user.
Technical conceive of the present invention is: owing to coexisting in formula frequency spectrum access method, cognitive user and authorized user use identical frequency spectrum to communicate simultaneously, all the time interference is there is mutually, make originally to be not fully utilized with regard to very limited frequency spectrum resource, the performance of authorized user and cognitive user also can be affected due to interference.When there being multiple understanding user in cognitive system, the performance obtained after selecting the frequency spectrum of different cognitive user insertion authority users can be different.In this patent method, system is based on the frequency spectrum of best performance way selection cognitive user by the mode insertion authority user of cooperation, authorized user and cognitive user send information respectively by different time and bandwidth, effectively can solve the interference problem between authorized user and cognitive user, and improve the performance of cognitive user.
Beneficial effect of the present invention is mainly manifested in: (1) eliminates the interference problem of authorized user and cognitive user in the formula frequency spectrum access method that coexists; (2) performance of understanding user is improved.
Accompanying drawing explanation
Fig. 1 is the anti-interference frequency spectrum access model schematic diagram of the inventive method, wherein, and h 1for authorized user transmitting terminal is to the channel coefficients of authorizing receiving terminal, h 2, kfor authorized user transmitting terminal is to cognitive user transmitting terminal ST kchannel coefficients, h 3, kfor cognitive user transmitting terminal ST kto the channel coefficients of authorizing receiving terminal, h 4, kfor cognitive user transmitting terminal ST kto the channel coefficients of cognitive receiving terminal.Suppose path loss index ν=4, L=20, W=1, P p/ N 0=5dB, R t=2.5bps/Hz, P s,k/ N 0=P s/ N 0;
Fig. 2 is cognitive user selection figure, and in figure, PT and PR lays respectively on point (0,0) on two-dimentional X-Y axle and (1,0).SR is positioned at (0.5 ,-0.5), cognitive user ST k, k ∈ L={1,2,3 ..., the mid point that L} is randomly dispersed in PT and PR line is the center of circle, and 0.5 is in the circle of radius.ST bfor the cognitive user adopting the inventive method to select;
Fig. 3 is that authorized user and cognitive system speed are along with P s/ N 0variation diagram;
Fig. 4 is that time and allocated bandwidth are along with P s/ N 0variation diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 4, a kind of cognitive user system of selection based on best performance, realizes based on existing radio communications system.Described radio communications system comprises a main system and a cognitive system, and wherein main system is made up of an authorized user transmitting terminal (PT) and mandate receiving terminal (PR).Main system supports relay function, the mandate frequency spectrum be made up of one section of W bandwidth.Cognitive user system is by L cognitive user transmitting terminal (ST k, k ∈ L={1,2,3 ..., L}) and common cognitive user receiving terminal (SR) composition.Cognitive system can simulate radio protocol in main system and system parameters.
In the method for present embodiment, cognitive user is with the frequency spectrum of cooperation mode insertion authority user.After cognitive user receives the information of authorized user, help the information sending authorized user to mandate receiving terminal by decoding forward collaboration mode.Each cognitive user ST kcalculate the speed R that authorized user can be helped to reach after oneself insertion authority user frequency spectrum p,k.Find out all authorized users that can help and reach targeted rate R tcognitive user ST kthe set M of composition, M={k|k ∈ L, R p,k>=R t.A cognitive user ST is selected in set M b, authorized user distributes portion of time to this cognitive user, authorizes it to access the frequency spectrum of oneself, ST bafter the frequency spectrum of insertion authority user, the information utilizing a part of bandwidth to forward authorized user helps it to reach targeted rate, utilizes remaining bandwidth to send the information of oneself; If M is empty set, namely | M|=0, represents and does not have cognitive user that authorized user can be helped to reach targeted rate, then authorized user continues through to direct transfer and sends the information of oneself;
Cognitive user ST in present embodiment kauthorized user R after insertion authority user frequency spectrum p,kwith the speed R that cognitive user obtains s,kcan obtain by the following method:
Cognitive user is by the frequency spectrum of two time slot decoding forward collaboration mode insertion authority users.At first time slot, holding time t k, the whole W bandwidth of PT sends information to PR and ST k.So PT → ST kthe speed of link can be expressed as:
Wherein, p prepresent the transmitting power of authorized user, γ 2, kfor PT to ST kthe channel gain of link, N 0for noise power spectral density.
At second time slot, holding time (1-t k), ST kuse b kw bandwidth helps the information of the PT of decoding to send to PR, so ST kthe speed of → PR link can be expressed as:
Wherein, p s,krepresent cognitive user ST ktransmitting power, γ 1for the channel gain of PT to PR link, γ 3, kfor ST kto the channel gain of PR link.So the speed that authorized user is obtained under the help of cognitive user by two time slots can be expressed as:
Meanwhile, cognitive user utilizes remaining (1-b k) W bandwidth sends oneself information, so the obtainable speed of cognitive user can be expressed as:
R s,k＝(1-t k)(1-b k)R 4,k(4)
Wherein, γ 4, kfor ST kto the channel gain of SR link.
Time in present embodiment and bandwidth allocation methods are specially:
Time between authorized user and cognitive user and allocated bandwidth can be modeled as:
Satisfy condition
Above-mentioned optimal time is obtained by Mathematics Optimization Method and allocated bandwidth
Will with substitution formula (4), the maximum rate that can obtain cognitive system acquisition is:
Wherein A=(R 2, k-R t), B=(R 5, k-R d), C=(R 2, k+ R 3, k-R 5, k), D=(R 2, k-R d).
The anti-interference frequency spectrum access method of cooperation based on time and bandwidth combined optimization of the present embodiment, effectively can eliminate the interference problem of authorized user and cognitive user in the formula frequency spectrum access method that coexists, and improve the performance of cognitive user.
In the frequency spectrum access method of this enforcement, at cognitive user ST k, middle selection cognitive user ST binsertion authority frequency spectrum.Show the cognitive user adopting the inventive method to select in fig. 2.
In the frequency spectrum access method of this enforcement, select the cognitive user ST of insertion authority frequency spectrum bwith the frequency spectrum of cooperation mode insertion authority user, holding time (1-t b), utilize the b that part access obtains bw bandwidth helps the information forwarding authorized user, utilizes residue (1-b b) W bandwidth sends oneself information.Authorized user and cognitive user send information respectively by different time and bandwidth, can not produce interference mutually.The cognitive user ST of Systematic selection insertion authority frequency spectrum is shown at Fig. 3 brear authorized user and cognitive system speed are along with P s/ N 0variation diagram; Show the cognitive user ST of Systematic selection insertion authority frequency spectrum in the diagram btime and allocated bandwidth along with P s/ N 0variation diagram.

Claims (3)

1. the cognitive user system of selection based on best performance, radio communications system comprises a main system and a cognitive system, wherein, authoring system is made up of an authorized user transmitting terminal and authorized user receiving terminal, described authoring system supports relay function, the mandate frequency spectrum be made up of one section of W bandwidth; Cognitive system is made up of L cognitive user transmitting terminal and a common cognitive user receiving terminal, and it attempts the frequency spectrum utilizing possible transmission opportunity insertion authority system.We suppose that cognitive system can simulate radio protocol and the system parameters of authoring system; The anti-interference frequency spectrum access method of described cooperation comprises following process:
1) cognitive user is with the frequency spectrum of cooperation mode insertion authority user, after cognitive user receives the information of authorized user, helps the information sending authorized user to authorized user receiving terminal by decoding forward collaboration mode;
2) each cognitive user ST kcalculate the speed R that authorized user can be helped to reach after oneself insertion authority user frequency spectrum p,k;
3) find out all authorized users that can help and reach targeted rate R tcognitive user ST kthe set M of composition, M={k|k ∈ L, R p,k>=R t;
4) in set M, a cognitive user ST is selected b, authorized user distributes portion of time to this cognitive user, authorizes it to access the frequency spectrum of oneself, ST bafter the frequency spectrum of insertion authority user, the information utilizing a part of bandwidth to forward authorized user helps it to reach targeted rate, utilizes remaining bandwidth to send the information of oneself; If M is empty set, namely | M|=0, represents and does not have cognitive user that authorized user can be helped to reach targeted rate, then authorized user continues through to direct transfer and sends the information of oneself;
Time between authorized user and cognitive user and bandwidth allocation problems are modeled as:
Meet the following conditions
Wherein, R trepresent the targeted rate of authorized user, t krepresent that authorized user sends the time shared by oneself information at the first time slot, b krepresent understanding user ST kauthorized user is helped to reach targeted rate bandwidth used at second time slot.R p,kand R s,kshow cognitive user ST respectively kafter the frequency spectrum of insertion authority user, the speed that authorized user and cognitive user obtain,
R s，k＝(1-t k)(1-b k)R 4，k(4)
Wherein p s,krepresent cognitive user ST ktransmitting power, γ 4, krepresent the channel gain of cognitive user transmitting terminal to cognitive user receiving terminal link, N 0represent noise power spectral density, with represent the speed that authorized user obtains at first time slot and second time slot respectively:
Wherein p prepresent the transmitting power of authorized user, γ 1and γ 2, krepresent that authorized user transmitting terminal is to authorized user receiving terminal with to cognitive user transmitting terminal ST respectively kthe channel gain of link, γ 3, krepresent cognitive user transmitting terminal ST kto the channel gain of authorized user receiving terminal link;
Above-mentioned optimal time is obtained by Mathematics Optimization Method and allocated bandwidth
(7), (8) are substituted into (4), and the speed obtaining being familiar with user is
Wherein A=(R 2, k-R t), B=(R 5, k-R d), C=(R 2, k+ R 3, k-R 5, k), D=(R 2, k-R d).
2., as claimed in claim 1 based on the cognitive user system of selection of best performance, it is characterized in that: described step 1) in, cognitive user is by the frequency spectrum of two slot decoder forward collaboration mode insertion authority users;
At first time slot, holding time t k, 0 < t k< 1, the whole W bandwidth of authorized user transmitting terminal sends information to mandate receiving terminal and cognitive user transmitting terminal, so authorized user transmitting terminal to the speed of cognitive user transmitting terminal link is:
At second time slot, holding time (1-t k), cognitive user transmitting terminal b kw bandwidth helps the information of the authorized user transmitting terminal of decoding to send to mandate receiving terminal, 0 < b k< 1, so cognitive user transmitting terminal to authorizing the speed of receiving terminal link is:
So the speed that authorized user is obtained under the help of cognitive user by two time slots is:
Meanwhile, cognitive user utilizes remaining (1-b) W bandwidth to send the information of oneself, so the speed that cognitive user obtains is:
R s,k＝(1-t k)(1-b k)R 4,k(4)。
3., as claimed in claim 1 or 2 based on the cognitive user system of selection of best performance, it is characterized in that: described step 4) in, cognitive user ST bselect by the following method: the frequency spectrum selecting to obtain the cognitive user insertion authority user of optimal performance, namely select cognitive user ST k, m={k|k ∈ L, R p,k[i]>=R t, the frequency spectrum of insertion authority user.
CN201510464053.3A 2015-07-31 2015-07-31 Cognitive user selection method based on optimal performance Pending CN105162538A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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CN106131857A (en) * 2016-07-29 2016-11-16 浙江工业大学 A kind of bandwidth based on contract and power joint optimize collaboration frequency spectrum sharing method
CN107707290A (en) * 2017-10-11 2018-02-16 中山大学新华学院 Based on two-channel trunking method

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CN103997744A (en) * 2014-05-07 2014-08-20 浙江工业大学 Cooperative anti-interference spectrum access method based on time and bandwidth combined optimization
CN104010313A (en) * 2014-01-13 2014-08-27 浙江工业大学 Cooperation interference-resistant frequency spectrum access method based on Nash game theory
CN104270821A (en) * 2014-07-16 2015-01-07 浙江工业大学 Anti-interference spectrum access method based on user fairness

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Publication number Priority date Publication date Assignee Title
CN104010313A (en) * 2014-01-13 2014-08-27 浙江工业大学 Cooperation interference-resistant frequency spectrum access method based on Nash game theory
CN103987050A (en) * 2014-04-14 2014-08-13 浙江工业大学 Anti-interference frequency spectrum access method based on full duplex OFDM cooperation
CN103997744A (en) * 2014-05-07 2014-08-20 浙江工业大学 Cooperative anti-interference spectrum access method based on time and bandwidth combined optimization
CN104270821A (en) * 2014-07-16 2015-01-07 浙江工业大学 Anti-interference spectrum access method based on user fairness

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106131857A (en) * 2016-07-29 2016-11-16 浙江工业大学 A kind of bandwidth based on contract and power joint optimize collaboration frequency spectrum sharing method
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